Table of Contents
Advertisement
TRANSMISSION - NGC
P0888-RELAY OUTPUT ALWAYS OFF —
TEST
1
NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the Service Information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIII , read Engine DTC's. Check and repair all Engine DTC's prior to
performing any transmission symptom diagnostics.
With the DRBIII , read Transmission DTC's. Record all DTC's and 1 Trip Failures.
NOTE: Diagnose 1 Trip Failures as a fully matured DTC.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test
for P0706 Check Shifter Signal.
For Gear Ratio DTC's, check and record all CVI's.
Most DTC's set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
NOTE: Verify flash level of Powertrain Control Module. Some problems are
corrected by software upgrades to the Transmission and Engine software.
NOTE: Check for applicable TSB's related to the problem.
Perform this procedure prior to Symptom diagnosis.
Continue
2
With the DRBIII , Check the STARTS SINCE SET counter for P0888.
Note: This counter only applies to the last DTC set.
Is the STARTS SINCE SET counter equal to 0?
Yes → Go To 3
No
3
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Using a 12-volt test light connected to ground, check the Fused B+ circuit in the
Transmission Control Relay connector.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes → Go To 4
No
4
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper wire between the Fused B+ circuit and the Transmission Control
Relay Output circuit.
Ignition on, engine not running.
With the DRBIII in Transmission Sensors, read the Switched Battery voltage.
Does the Switched Battery voltage read battery voltage?
Yes → Go To 5
No
ACTION
Go To 2
→ Go To 13
→ Go To 10
→ Repair the Transmission Control Relay Output circuit for an open
or high resistance. Note: There are multiple Transmission Control
Relay Output circuits.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
Continued
112
APPLICABILITY
All
All
All
All
Advertisement
Table of Contents
